WindFire 21 LED UV Ultra Violet Light Pocket Size Flashlight for Spotting Scorpions, Bed Bugs, Counterfeits, A/C Leaks, Glass Break, Bugs/insect Detection, Locate Dangerous Pests (No battery) Emits 395 nanometer wavelength, hunting scorpions and minerals. "O" rings for water resistance (Not Submersible),Rugged and durable, shock resistant Essential tool for law enforcement, postal inspections, customs, medical forensics, HVAC repair. Battery Required: 3 x AAA Alkaline Battery (Not Included) Mini ultra portable, easy to take with. Click on and off switch.